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|
module Propellor.Property.Fstab (
FsType,
Source,
MountPoint,
MountOpts(..),
module Propellor.Property.Fstab,
) where
import Propellor.Base
import qualified Propellor.Property.File as File
import Propellor.Property.Mount
import Data.Char
import Data.List
import Utility.Table
-- | Ensures that </etc/fstab> contains a line mounting the specified
-- `Source` on the specified `MountPoint`, and that it's currently mounted.
--
-- For example:
--
-- > mounted "auto" "/dev/sdb1" "/srv" mempty
--
-- Note that if anything else is already mounted at the `MountPoint`, it
-- will be left as-is by this property.
mounted :: FsType -> Source -> MountPoint -> MountOpts -> Property Linux
mounted fs src mnt opts = tightenTargets $
listed fs src mnt opts
`before` mountnow
`requires` File.dirExists mnt
where
-- This use of mountPoints, which is linux-only, is why this
-- property currently only supports linux.
mountnow = check (notElem mnt <$> mountPoints) $
cmdProperty "mount" [mnt]
-- | Ensures that </etc/fstab> contains a line mounting the specified
-- `Source` on the specified `MountPoint`. Does not ensure that it's
-- currently `mounted`.
listed :: FsType -> Source -> MountPoint -> MountOpts -> Property UnixLike
listed fs src mnt opts = "/etc/fstab" `File.containsLine` l
`describe` (mnt ++ " mounted by fstab")
where
l = intercalate "\t" [src, mnt, fs, formatMountOpts opts, dump, passno]
dump = "0"
passno = "2"
-- | Ensures that </etc/fstab> contains a line enabling the specified
-- `Source` to be used as swap space, and that it's enabled.
swap :: Source -> Property Linux
swap src = listed "swap" src "none" mempty
`onChange` swapOn src
newtype SwapPartition = SwapPartition FilePath
-- | Replaces </etc/fstab> with a file that should cause the currently
-- mounted partitions to be re-mounted the same way on boot.
--
-- For each specified MountPoint, the UUID of each partition
-- (or if there is no UUID, its label), its filesystem type,
-- and its mount options are all automatically probed.
--
-- The SwapPartitions are also included in the generated fstab.
fstabbed :: [MountPoint] -> [SwapPartition] -> Property Linux
fstabbed mnts swaps = property' "fstabbed" $ \o -> do
fstab <- liftIO $ genFstab mnts swaps id
ensureProperty o $
"/etc/fstab" `File.hasContent` fstab
genFstab :: [MountPoint] -> [SwapPartition] -> (MountPoint -> MountPoint) -> IO [String]
genFstab mnts swaps mnttransform = do
fstab <- liftIO $ mapM getcfg (sort mnts)
swapfstab <- liftIO $ mapM getswapcfg swaps
return $ header ++ formatTable (legend : fstab ++ swapfstab)
where
header =
[ "# /etc/fstab: static file system information. See fstab(5)"
, "# "
]
legend = ["# <file system>", "<mount point>", "<type>", "<options>", "<dump>", "<pass>"]
getcfg mnt = sequence
[ fromMaybe (error $ "unable to find mount source for " ++ mnt)
<$> getM (\a -> a mnt)
[ uuidprefix getMountUUID
, sourceprefix getMountLabel
, getMountSource
]
, pure (mnttransform mnt)
, fromMaybe "auto" <$> getFsType mnt
, formatMountOpts <$> getFsMountOpts mnt
, pure "0"
, pure (if mnt == "/" then "1" else "2")
]
getswapcfg (SwapPartition s) = sequence
[ fromMaybe s <$> getM (\a -> a s)
[ uuidprefix getSourceUUID
, sourceprefix getSourceLabel
]
, pure "none"
, pure "swap"
, pure (formatMountOpts mempty)
, pure "0"
, pure "0"
]
prefix s getter m = fmap (s ++) <$> getter m
uuidprefix = prefix "UUID="
sourceprefix = prefix "LABEL="
-- | Checks if </etc/fstab> is not configured.
-- This is the case if it doesn't exist, or
-- consists entirely of blank lines or comments.
--
-- So, if you want to only replace the fstab once, and then never touch it
-- again, allowing local modifications:
--
-- > check noFstab (fstabbed mnts [])
noFstab :: IO Bool
noFstab = ifM (doesFileExist "/etc/fstab")
( null . filter iscfg . lines <$> readFile "/etc/fstab"
, return True
)
where
iscfg l
| null l = False
| otherwise = not $ "#" `isPrefixOf` dropWhile isSpace l
|
